You could just be describing a rear derailleur that's out of adjustment. If it's trying to pull the chain onto the next cog, but not quite making it, you could maybe describe that as "slipping." New cables always stretch and need a little tightening up. That's easily done, but if you've never done it before, let your LBS show you, especially since you have free maintenance and none of us is completely sure what you're describing.



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